<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>rw6-2</title>
    <style>
        #left {float: left;width: 70%;background-color: cornflowerblue;height: 600px;float: left;}
        #right {float: right;height: 600px;background-color: beige;float: right;}
        body{
            font-size: 50px;
        }
    </style>

<body>

<div id="left">自适应输入框，可以根据页面大小进行调整。</div>
<div id="right">固定栏         导航栏</div>
</body>
</html>